Muffler



s- 6, 1941- r F. 5. DERE'MER 2 6 MUFFLER Filed Nov. 4, 1940 INVEN OR.

ATTORNEY.

Patented Aug. 26, 1941 UNITED STATES PATENT OFFICE MUFFLER Floyd E. Deremer, Detroit, Mich. Application November 4, 1940, Serial No. 364,135

2 Claims. (01. 181-48) This application relates to exhaust muliier or silencer constructions particularly useful with internal combustion-engines.

The patent to Oldberg #1,9'l5,861 of October 9, 1934, discloses an exhaust silencer in which there is a through flow tube, such as the tube side the tube. Perforations .u open into such tunnel at opposite ends thereof so as to provide ll of Fig. 1, through which the sound waves and gases flow. The through flow tube ll there shown is provided with numerous small perforations I! opening into the surrounding chamber R. The

communications. j 1

The trough i5 is a convenient and inexpensive device for aiding in silencing. It has been.

found particularly useful where the through flow tube is itself formed with a restrictor, such as is 1 shown at 20 in Fig. 3 hereof, as well as in a pattube ll of that muffler is representative of those called "through flow.

It is to mufflers having tubes of that type, namely, the through flow type, that the invention hereof relates.

The principal object of the present-invention pended drawing. In this drawing- Fig. 1 shows a through flow tubeof a silencer,

to which is applied a silencing means of the invention;

Fig. 2 is a diagrammatic cross-section view on line 2-2 of Fig. 1;

Fig. 3 is a diagrammatic longitudinal view, corresponding to Fig. 1, and showing the use of a restrictor in the through flow tube;

Fig. 4 shows the part to be applied to a through flow tube. I

Referring to the drawing, it will be seen that Fig. 1 shows, for use aspart of a mufller, as for example, as the through flow tube ll of the mufller of Fig. 1 of the Oldberg Patent #l,975,- 861, a tube III having numerous perforations H. With such a tube, there may be utilized the part l5 which is in the form of a U shaped trough having its end open. The longitudinal edges ID of the trough may be secured to opposite sides of the tube to provide a tunnel I! (Fig. 3) alongcut to Deremer No.2,139,151, of December 6, 1938, where the through flow tube H thereof is indicated as having a restrlctor 20, as well as numerous perforations in advance of as well as behind the restrictor.

The means hereof has been utilized successfully on various types of mumers. One type upon which it has been used, shown in the patent to Oldberg #1,950,455, is known as the multiple pass silencer. In this embodiment, troughs I! were utilized on the inner tubes l1 and I8 of the in-- let and return passages 7 Now having described the means herein disclosedyreference should be had to the claims tion engines, a through flow tube, and a U shaped trough having its ends open, and its longitudinal edges secured to opposite sides of the tube to provide a tunnel alongside the tube, the tube having perforations opening to opposite ends of the tunnel.

2. In an exhaust silencer for internalcombustion engines, a through flow tube, and a U shaped trough having its ends open, and its longitudinal edges secured to opposite sides of the tube to provide a tunnel alongside the tube, the tube having Dflrforations opening. to opposite ends of the tunnel, the tube having a restrlctor between said perforations.

FLOYD E. 

